Pre-heat the Forman grill. Drain the tuna and squeeze out most but not all of the water. Mix well in a medium bowl with 2 egg whites. Add the diced celery, diced red onion, Italian dressing, white pepper, Dijon mustard, bread crumbs, and Tabasco then fully incorporated. Divide the mixture into 4 balls and form into burger patties. Place the patties on the grill 2 or 4 at a time depending on the size of your grill. Gently and carefully close the lid and grill for five minutes. Serve on a toasted roll with shredded lettuce or just on top of dressed salad greens.